ISSN:1003-8620

CN:42-1243/TF

主管:中信泰富特钢集团股份有限公司

主办:大冶特殊钢有限公司

特殊钢 ›› 2019, Vol. 40 ›› Issue (3): 32-34.

• 工艺技术 • 上一篇    下一篇

120 t BOF-LF-RH-410 mm x530 mm 大方坯连铸 18CrNiMo7-6 钢的工艺实践

李博鹏1,2, 王占忠1,柳萍1,张光鸿1,郑文超1,饶金元1,王川1   

  1. 1大冶特殊钢股份有限公司技术中心,黄石435001 ;
    2高品质特殊钢湖北省重点实验室,黄石435001
  • 收稿日期:2018-11-23 出版日期:2019-06-01 发布日期:2022-05-16
  • 作者简介:李博鹏(1981-),男,硕士(2012年北京科技大学)工程师,2003年太原理工大学(本科)毕业,新产品研发。

Practice of Steel 18CrNiMo7-6 Bloom by Process of 120 t BOF-LF-RH-410 mm x 530 mm Continuous Casting

Li Bopeng1,2, Wang Zhanzhong1, Liu Ping1, Zhang Guanghong1, Zheng Wenchao1, Rao Jinyuan1 , Wang Chuan1   

  1. 1 Daye Special Steel Co. ,Ltd,Technology Center, Huangshi 435001 ;
    2 High Quality Special Steel Key Lab of Hubei Province, Huangshi 435001
  • Received:2018-11-23 Published:2019-06-01 Online:2022-05-16

摘要: 采用铁水+废钢-120 t转炉-LF-RH-410 mm×530 mm大方坯连铸-步进式加热炉-750轧机轧制-退火的流程生产规格Φ115~250 mm 18CrNiMo7-6(/%:0.15~0.19C,0.25~0.40Si,0.40~0.60Mn,1.50~1.80Cr,1.40~1.70Ni,0.25~0.35Mo,≤0.020P,≤0.020S,0.020~0.040Al,0.0100-0.0200N)。通过控制出钢预脱氧和合金化,深真空时间≥15 min,软吹氮气,控制中间包钢水过热度,拉速0.48 m/min,全过程Ar气保护,连铸M-EMS和F-EMS,轧制后退火等工艺措施,生产的产品宏观夹杂物检测含量≤20mm/dm3,碳中心偏析指数≤1.10,晶粒度≥7级,钢材各项指标满足协议要求。

关键词:  410 mm x 530 mm连铸坯, 18CrNiMo7-6钢, 宏观夹杂物, 晶粒度

Abstract: The steel grade 18CrNiMo7-6 with diameter of Φ115 ~250 nun round from process route of hot metal + scrap-120 t BOF-RH- 410 mm x530 mm continuous casting-bloom heating by walking forward heating fumace-750 rolling¬annealing. Its chemical composition is (/% : 0. 15 ~ 0. 19C, 0. 25 ~ 0. 40Si, 0. 40 ~ 0. 60Mn, 1.50 ~ 1. 80Cr, 1.40 ~ 1.70Ni, 0.25 ~0. 35Mo, W0. 020P, W0. 020S,0.020 ~ 0. 040Al, 0.0100 ~ 0.0200N). Through deoxidization and alloy addition during tapping, deep vacuum degassing not less than 15 minutes, soft bubbling with Nitrogen, super heat control in tundish, casting speed of 0. 48 m/min, full process argon protection and applications of F-EMS and M-EMS, annealing after rolling etc. , the final product's macro-inclusion not more than 20 mm/dm3, carbon center segregation not more than 1. 10 and grain size finer than 7, which meet the specification requirements.